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Business Segments (Schedule Of Segment Reporting Information By Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Revenue from External Customer [Line Items] |  |  |  |  |
Net Sales |  |  | $ 677,892 | $ 903,582 | $ 798,223
Sales |  |  | 704,825 | 938,564 | 826,455
Total |  |  | (17,271) | 79,016 | 102,108
Interest income |  |  | 522 | 57 | 73
Interest expense |  |  | 11,607 | 4,990 | 3,386
Stock option-based compensation expense |  |  | 231 | 1,424 | 2,495
Pension settlement loss | $ 66,700 | $ 25,600 | 92,291 | 0 | 0
Corporate expenses, net |  |  | 39,414 | 41,221 | 41,970
Income (loss) before income taxes |  |  | (160,030) | 32,844 | 67,110
Income tax expense (benefit) |  |  | (54,125) | 4,389 | 9,284
Net income (loss) |  |  | (105,905) | 28,455 | 57,826
kaleo |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Gain (loss) on investment accounted for under the fair value method |  |  | 262 | 1,406 | 12,780
PE Films |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Net Sales |  |  | 76,763 | 97,571 | 118,920
Earnings before interest, taxes, depreciation and amortization (EBITDA) |  |  | 11,217 | 11,949 | 27,694
Cost, Depreciation and Amortization |  |  | 6,522 | 6,280 | 6,263
Earnings before interest and taxes (EBIT) |  |  | 4,695 | 5,669 | 21,431
Plant shutdowns, asset impairments, restructurings and other |  |  | (4,972) | (646) | (371)
Aluminum Extrusions |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Net Sales |  |  | 474,803 | 637,872 | 539,325
Earnings before interest, taxes, depreciation and amortization (EBITDA) |  |  | 37,976 | 66,800 | 55,948
Cost, Depreciation and Amortization |  |  | 17,927 | 17,414 | 16,272
Earnings before interest and taxes (EBIT) |  |  | 20,049 | 49,386 | 39,676
Plant shutdowns, asset impairments, restructurings and other |  |  | (3,557) | (310) | 3,237
Flexible Packaging Films |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Net Sales |  |  | 126,326 | 168,139 | 139,978
Plant shutdowns, asset impairments, restructurings and other |  |  | (113) | (91) | 8,439
PET Films |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Earnings before interest, taxes, depreciation and amortization (EBITDA) |  |  | 4,383 | 27,452 | 31,684
Cost, Depreciation and Amortization |  |  | 2,865 | 2,444 | 1,988
Earnings before interest and taxes (EBIT) |  |  | 1,518 | 25,008 | 29,696
Freight |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Cost of Goods and Services Sold |  |  | $ 26,933 | $ 34,982 | $ 28,232

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